#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
char* my_strcpy(char* target,char* start)
{
	char* ret = target;
	while (*(target++) = *(start++))
	{
		;
	}
	return ret;
}
int main()
{
	char a[20] = "0";
	char b[20] = "hello world!";
	my_strcpy(a, b);
	printf("%s\n", a);
	return 0;
}